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Letters Patent No. 61,6l3, dateol January 29, 1867:

IMPROVEMBNT IN sTovE-PIPE DAMPERS.

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TO ALL WHOM IT MAY GONOERN:

'Be it known that I, DANIEL DE GARMO, of Rochester, in the county ofMonroe, and State of NewfYork,

have invented certain new and useful imprcvements in Stave-Pipe Dampersgand I do hereby .declare that the following is'a full, clear, andexactdescription thercof, reference being had to the acccmpanying drawings,making partrof thi's specification, in which-- A Figure 2 is a sectionalview of my invention, in the direction of the red line r, fig. 1.

Figure 1 is a top or face view of 'the same.t

This invention consists in providing a simple and cheap 'steve-pipe(lamper, which may loev regulated or adjusted to suit chimneys or pipeshaving a greater or a less draught, which featurepermits the (lamper tobe used in pipes having but a very light draught.

To enable others to make and use my invention I will describe itsconstruction and operatioin,

The two spherical plates Av and B are each provided With suitableopenings, a and b,to prevent the entire obstruction of the smoke andgases, when the (lamper is-turned square across: The plate B is providedon two opposite sides with lugs, g and h, to lWhich the axial bearingsor journals j and k are'cast. These lugsihave each a bra'ce or rib, r,in the outer end of which is formcd a rccess, c, to receive the circularrim 'm' of the plate A. The plates A and B are east with a countersunkhole in thc centre, and they are securely held together by means of thepivot-bolt or rivetf, and at the same time the plate A may be rotatedupon that axis,v so as to cause the openings a to register to theopenings b, or partially so, or so that a d shall bo opposite to theSpaces between b b. The latter adjustment would be proper for a damperto be used vin a pipe having a very strong draught, and the otheradjustments to a less draught. There may be a slight recess in onc ofthe lugs, and corresponding points so arranged upon the plate A as toretain the plates in any desired adjustment. v If the plates should bemade in one casting, the pivot f would not be required. The lugs aregrcatly strengthened gby the rib'or r'm m re'sting inthe recess c. Thelips d,- on plate A, are provided for convenience' in changing therelative adjustment of the plates A and B when the (lamper is beingplaced in the pipe. The platcs are made in an ordinary. two-part flask,and so'as to match each other without any subsequent fitting. i

What I claim as my invention, and desirc to secnre by Letters Patcnts,is- I The arrangement, in steve-pipe dampers, of the plates A and B,journals]l k, rib or' rim m, and recesses c, i

pivot bolt f,'and openings a b, in` the manner and for the purposes setforth` i D. DE GARMO.

Witnesses:

DANIEL CRENNELL, WM, S. Loocnnoncucn.

